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+---
+title: 'FileReader: load event'
+slug: Web/API/FileReader/load_event
+tags:
+  - load 事件
+translation_of: Web/API/FileReader/load_event
+---
+<div>{{APIRef}}</div>
+
+<p>当文件成功读取时，执行<code>load</code> 事件</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">是否冒泡</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">是否能中断退出</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">调用接口</th>
+   <td>{{domxref("ProgressEvent")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">事件处理属性</th>
+   <td>{{domxref("FileReader.onload")}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="Live_example">Live example</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div class="example"&gt;
+
+    &lt;div class="file-select"&gt;
+        &lt;label for="avatar"&gt;Choose a profile picture:&lt;/label&gt;
+        &lt;input type="file"
+               id="avatar" name="avatar"
+               accept="image/png, image/jpeg"&gt;
+    &lt;/div&gt;
+
+    &lt;img src="" class="preview" height="200" alt="Image preview..."&gt;
+
+    &lt;div class="event-log"&gt;
+        &lt;label&gt;Event log:&lt;/label&gt;
+        &lt;textarea readonly class="event-log-contents"&gt;&lt;/textarea&gt;
+    &lt;/div&gt;
+
+  &lt;/div&gt;</pre>
+
+<div class="hidden">
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">img.preview {
+  margin: 1rem 0;
+}
+
+.event-log-contents {
+  width: 18rem;
+  height: 5rem;
+  border: 1px solid black;
+  margin: .2rem;
+  padding: .2rem;
+}
+
+.example {
+  display: grid;
+  grid-template-areas:
+              "select  log"
+              "preview log";
+}
+
+.file-select {
+  grid-area: select;
+}
+
+.preview {
+  grid-area: preview;
+}
+
+.event-log {
+  grid-area: log;
+}
+
+.event-log&gt;label {
+  display: block;
+}
+
+.event-log-contents {
+  resize: none;
+}</pre>
+</div>
+
+<h4 id="JS">JS</h4>
+
+<pre class="brush: js">const fileInput = document.querySelector('input[type="file"]');
+const preview = document.querySelector('img.preview');
+const eventLog = document.querySelector('.event-log-contents');
+const reader = new FileReader();
+
+function handleEvent(event) {
+    eventLog.textContent = eventLog.textContent + `${event.type}: ${event.loaded} bytes transferred\n`;
+
+    if (event.type === "load") {
+        preview.src = reader.result;
+    }
+}
+
+function addListeners(reader) {
+    reader.addEventListener('loadstart', handleEvent);
+    reader.addEventListener('load', handleEvent);
+    reader.addEventListener('loadend', handleEvent);
+    reader.addEventListener('progress', handleEvent);
+    reader.addEventListener('error', handleEvent);
+    reader.addEventListener('abort', handleEvent);
+}
+
+function handleSelected(e) {
+    eventLog.textContent = '';
+    const selectedFile = fileInput.files[0];
+    if (selectedFile) {
+        addListeners(reader);
+        reader.readAsDataURL(selectedFile);
+    }
+}
+
+fileInput.addEventListener('change', handleSelected);
+</pre>
+
+<h4 id="结果">结果</h4>
+
+<p>{{ EmbedLiveSample('Live_example', '100%', '300px') }}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('File API', '#dfn-load-event')}}</td>
+   <td>{{Spec2('File API')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">在这个页面中的兼容性表格从标准化的数据中生成。如果你想贡献数据，请检查<a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 并发送提交请求。</div>
+
+<p>{{Compat("api.FileReader.load_event")}}</p>
+
+<h2 id="请参阅">请参阅</h2>
+
+<ul>
+ <li>Related events: {{domxref("FileReader.loadstart_event")}}, {{domxref("FileReader.loadend_event")}}, {{domxref("FileReader.progress_event")}}, {{domxref("FileReader.error_event")}}, {{domxref("FileReader.abort_event")}}</li>
+</ul>